One of the most common causes of GST notices is a mismatch between GSTR-1 and GSTR-3B. If you’re unsure how the two returns differ — or whether yours are in sync — this guide (and our filing team) can help.
What is GSTR-1?
- A sales/outward supply return reporting invoice-level details: B2B, B2C, exports, credit/debit notes, and HSN summary.
- Filed monthly (11th) or quarterly under QRMP (13th).
- Feeds directly into your buyers’ GSTR-2B, determining their ITC eligibility.
What is GSTR-3B?
- A self-declared summary return covering total sales, purchases, ITC claimed, and tax liability.
- This is where tax is actually paid.
- Filed monthly (20th) or on a staggered quarterly basis under QRMP.
Key Differences at a Glance
| Aspect | GSTR-1 | GSTR-3B |
| Purpose | Reports sales | Summary + tax payment |
| Detail level | Invoice-wise | Consolidated |
| Tax payment | No | Yes |
| ITC impact | Source for buyer’s ITC | Where ITC is claimed |
| Due date | 11th | 20th |
| Revisable | Limited | Not revisable once filed |
Why This Difference Matters for Your Business
- Mismatches trigger automated notices like DRC-01B.
- Officers routinely compare GSTR-1 sales figures against GSTR-3B tax paid.
- Errors in your GSTR-1 directly affect your customers’ ITC, which can damage business relationships.
Common Mistakes We See
- Different sales figures reported in GSTR-1 vs GSTR-3B for the same period.
- Delayed GSTR-1 filing, blocking recipients’ ITC.
- ITC claimed in GSTR-3B not matching GSTR-2B.
Let Us Keep Your Returns in Sync
At [Your Firm Name], we reconcile your GSTR-1 and GSTR-3B every single month before filing — so you never face a mismatch notice.
👉 Talk to Our GST Filing Team and file error-free, every month.
FAQs
Q1. Which return should I file first — GSTR-1 or GSTR-3B? GSTR-1 is generally filed first (by the 11th), followed by GSTR-3B (by the 20th), as GSTR-1 data feeds into ITC calculations.
Q2. Can I revise GSTR-3B after filing? No, GSTR-3B cannot be revised once filed — corrections are made in a subsequent period’s return.
Q3. What happens if GSTR-1 and GSTR-3B figures don’t match? You may receive a system-generated notice (DRC-01B) asking you to explain or pay the differential tax.
Conclusion
GSTR-1 tells the department what you sold; GSTR-3B is where you pay what you owe. Keeping both accurate and reconciled is non-negotiable. Reach out to Your Firm Name for stress-free, accurate monthly GST filing.
